Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy
Gao, Gui-Jia1; Zeng, Mei-Qi1; Zhang, En-Liang1; Zeng, Rong-Chang1,2; Cui, Lan-Yue1; Xu, Dao-kui3; Wang, Feng-Qin1; Kannan, M. Bobby4
Corresponding AuthorZeng, Rong-Chang( ; Wang, Feng-Qin(
AbstractThe microstructure and chemical compositions of the solid solution-treated Mg-3Nd-1Li-0.2Zn alloy were characterized using optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM), electron probe micro-analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS). The corrosion behaviour of the alloy was investigated via electrochemical polarization, electrochemical impedance spectroscopy (EIS), hydrogen evolution test and scanning Kelvin probe (SKP). The results showed that the microstructure of the as-extruded Mg-3Nd-1Li-0.2Zn alloy contained alpha-Mg matrix and nanometric second phase Mg41Nd5. The grain size of the alloy increased significantly with the increase in the heat-treatment duration, whereas the volume fraction of the second phase decreased after the solid solution treatment. The surface film was composed of oxides (Nd2O3, MgO, Li2O and ZnO) and carbonates (MgCO3 and Li2CO3), in addition to Nd. The as-extruded alloy exhibited the best corrosion resistance after an initial soaking of 10 min, whereas the alloy with 4h-solution-treatment possessed the lowest corrosion rate after a longer immersion (1 h). This can be attributed to the formation of Nd-containing oxide film on the alloys and a dense corrosion product layer. The dealloying corrosion of the second phase was related to the anodic Mg41Nd5 with a more negative Volta potential relative to alpha-Mg phase. The preferential corrosion of Mg41Nd5 is proven by in-situ observation and SEM. The solid solution treatment of Mg-3Nd-1Li-0.2Zn alloy led to a shift in corrosion type from pitting corrosion to uniform corrosion under long-term exposure. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordMagnesium alloy Corrosion Second phase Rare metal Dealloying
Funding OrganizationNational Natural Science Foundation of China ; SDUST Research Found
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[52071191] ; SDUST Research Found[2014TDJH104]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000661886200016
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZeng, Rong-Chang; Wang, Feng-Qin
Affiliation1.Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Corros Lab Light Met, Qingdao 266590, Peoples R China
2.Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450002, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
4.Univ Newcastle, Sch Engn, Callaghan, NSW 2308, Australia
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GB/T 7714
Gao, Gui-Jia,Zeng, Mei-Qi,Zhang, En-Liang,et al. Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,83:161-178.
APA Gao, Gui-Jia.,Zeng, Mei-Qi.,Zhang, En-Liang.,Zeng, Rong-Chang.,Cui, Lan-Yue.,...&Kannan, M. Bobby.(2021).Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,83,161-178.
MLA Gao, Gui-Jia,et al."Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 83(2021):161-178.
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